About the event
Title: High-throughput characterization of dynamic tensile failure in pure niobium and niobium-titanium alloy
Presenter: Dr. Arezoo Zare, WSU, School of Mechanical and Materials Engineering, Assistant Professor
Abstract: Niobium and its alloys offer a unique combination of high melting temperature (>2400 °C) and desirable ductility which makes them candid for applications under extreme thermomechanical environments. Despite this potential, our understanding of the dynamic and shock-induced mechanical response of these materials and the underlying deformation mechanisms remains limited. Herein, we characterize the shock-induced tensile failure (i.e., spall failure) of pure niobium and equiatomic niobium-titanium at strain rates of 105– 106 s-1 using novel high-throughput laser-driven micro-flyer impact experiments. By conducting tests over a range of impact velocities, we observe the full range of behaviors from incipient spall to complete spall failure and study the correlations between the spall strength and peak shock stress. Post-mortem characterization of the impact sites shows a mixed mode failure with ductile void growth and coalescence followed by brittle separation. Efforts are currently underway to clarify the links between the observed failure mechanisms and microstructure.
Biography: Arezoo Zare is an incoming Assistant Professor at the School of Mechanical and Materials Engineering at Washington State University. She received her PhD in Mechanical Engineering from Oklahoma State University and then joined the Hopkins Extreme Materials Institute as a Postdoctoral Fellow. With a background in Materials Science, Arezoo’s research interests are focused on microstructural design of materials with improved mechanical performance for applications in extreme environments. Her current and previous studies involve establishing fundamental structure-property relationships in refractory alloys, ultra-hard ceramics, amorphous alloys, and nanocomposites across multiple length and timescales.